⬆️ Bump flask from 2.0.1 to 2.2.2 in /docker-images

Bumps [flask](https://github.com/pallets/flask) from 2.0.1 to 2.2.2.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.0.1...2.2.2)

---
updated-dependencies:
- dependency-name: flask
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

docker-images/requirements.txt

@@ -1,3 +1,3 @@
 meinheld==1.0.2
 gunicorn==20.1.0
-flask==2.0.1
+flask==2.2.2